#include <iostream>
#include <string>
using namespace std;
int main(){
    string s,s1;
    cin>>s;
    for (char c : s){
        if (c== '(') {
            s1 += c;
	    }
        if (c == ')') {
            if (s1.length() > 0) {
                if (s1[ s1.length() - 1] == '(') {
                    s1.pop_back();
                }
            }
        }
    }
	if (s1.length() > 0)
        {cout << "false" << endl; }
	else
		{cout << "true" << endl; }
	return 0;
}
